依据GB/T 228-2002中规定的试验方法对TC4钛合金棒材进行了拉伸试验,对材料的力学性能包括屈服强度、抗拉强度、断后伸长率和断面收缩率进行了测试，从试样尺寸测量、试验机、引伸计、试验数据修约及材料的不均匀性等方面分析了测量标准不确定度产生的原因,对拉伸试验结果进行了不确定度评定,并对试验结论的判断进行了讨论。本方法对其他金属材料的棒材拉伸测量结果不确定度的评定具有一定的参考价值。

According to the method processes of GB/T 228-2002,tensile test was carried on TC4 titanium alloy bar. The mechanical properties of TC4 material,including the yield strength,tensile strength,the length after rupture and the shrinkage of fractured cross-section were measured. Meanwhile,the causes of the metal bar sample tensile testing uncertainty from the following aspects: sample size measuring,testing machines,extensometers,the revision of test data and the material discontinuity and evaluated the uncertainty measurements were analyzed. Conclusion of the testing result was alsodiscussed. It would have a certain reference value to the evaluating of other metal bar material tensile uncertainty.